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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 144 $ 132
Accumulated depreciation (6,681) (6,444)
Accumulated amortization $ 644 $ 593
Common stock, par value (USD per share) $ 1 $ 1
Common stock, shares authorized (in shares) 250,000,000 250,000,000
Common stock, shares issued (in shares) 112,000,000 112,000,000
Common stock, shares outstanding (in shares) 62,000,000 63,000,000
Treasury stock (in shares) 50,000,000 49,000,000